-- put tables and their tables together local function __coalesce(...)  local coalesced = {}  for _, langslist in ipairs{...} do  for langcode, langnames in pairs(langslist) do  for _, langname in pairs(langnames) do  if not coalesced[langcode] then  coalesced[langcode] = {}  end  table.insert(coalesced[langcode], langname)  end  end  end   return coalesced end  -- make the keys lowercase local function __preprocess(t, first_of_array_in_array)  local preprocessed = {}  if first_of_array_in_array then  -- keep only the 1st language name for each code, excluding synonyms  for k, v in pairs(t) do  preprocessed[k:lower()] = {v[1]}  end  else  for k, v in pairs(t) do  preprocessed[k:lower()] = v  end  end   return preprocessed end  -- all valid primary language subtags for BCP47 from IANA (most of them from ISO 639-1, -2 and -3 with some exclusions) local __iana_languages = __preprocess(require("Module:Language/data/iana languages")); -- ISO 639-3 contains additional 3-letter codes not inserted in the IANA database as they are aliased to 2-letter codes, -- but excludes some deleted codes still valid in BCP47 (some of them are aliased) local __iso_639_3 = __preprocess(require("Module:Language/data/ISO 639-3")); -- Wikimedia wikis uses some non-standard codes and a subset of IANA codes, plus composite codes local __wp_languages = __preprocess(require("Module:Language/data/wp languages"), true); -- all valid script subtags for BCP47 from IANA (excluding special ISO 15924 codes) local iana_scripts = __preprocess(require("Module:Language/data/iana scripts")); -- all valid region subtags for BCP47 from IANA (derived from ISO 3166-1 excluding special codes, and from 3-digit UN M.49 codes for groups of countries) local iana_regions = __preprocess(require("Module:Language/data/iana regions"));  -- variant subtags from IANA; table format differs from the other IANA data tables local iana_variants = __preprocess(require("Module:Language/data/iana variants")); -- suppressed script subtags from IANA; local iana_suppressed_scripts = __preprocess (require("Module:Language/data/iana suppressed scripts"));  return {  lang = __coalesce(__wp_languages, __iana_languages, __iso_639_3),  lang_iana = __iana_languages,  script = iana_scripts,  region = iana_regions,  variant = iana_variants,  suppressed = iana_suppressed_scripts, }